The horizontal wetting front in big discharge rate is wider than that of small discharge rate , and the vertical wetting front in big discharge rate is shallower than that of small discharge rate . the horizontal wetting front of 5 . 3l / h is wider 17 percent than 2 l / h , and the vertical wetting front of 5 . 3 l / h is shallower 20 percent than 2 l / h 对滴头流量在2 5 . 3l h范围内的微源入渗分析表明，对应于同一灌水量，流量为5 . 3l h的水平湿润锋比2l h的大17而垂向湿润锋则比之小20 。
In general , the wetted soil volume is a semi - elliptic cone . the relationship between horizontal and vertical wetting front and infiltration time is remarkable power function . the relationship between wetted soil volume and infiltration time is remarkable stright line , and in case of certain volume of applied water , the wetted soil volume is not influenced by discharge rate 微源入渗的水平和垂向湿润锋与入渗时间存在极显著的幂函数关系；土壤湿润体体积与入渗时间之间存在显著的线性关系，直线斜率和供水强度有关；土壤湿润体体积和灌水量之间存在显著的线性关系，在灌水量一定的条件下，滴头流量对湿润体体积影响很小，在滴头流量为2 5 . 3l h的范围内，对于同一灌水量湿润体体积的差异保持在5以内。
When the saline water ( < 3g / l ) infiltrated to 45cm , the top soil of 0 - 37cm was desalinized , when the saline water of 3g / l infiltrated , the desalinized depth was 0 - 15cm . moreover , sar of top soil increased with the sar of the infiltration water . 3 . through lab experiment , the characteristics of soil water and salt movement under different initial soil moisture content were analyzed 当湿润深度为45cm时，小于3g l的微咸水入渗后， 0 - 37cm土层处于脱盐状态，而3g l的微咸水入渗， 0 - 15cm土层处于脱盐状态， 15cm - 35cm土层含盐量基本等于初始含盐量，但湿润锋处含盐量很高。
The results were as follows : 1 . on the basis of saline water infiltration , the characteristics of movement of soil water and salt under different cumulative infiltration were studied . the results indicated that when the salinity of the infiltration water was 3g / l , the top soil was desalinized and salt accumulated at the wetting front 通过对不同入渗水量下土壤水盐运移规律的室内模拟试验研究，结果表明利用矿化度为3g l水入渗后，土壤从上至下逐渐脱盐，上层土壤含盐量略低于土壤初始含盐量，中间土层基本保持土壤初始含盐量值，但湿润锋附近发生突变，含盐量达最大值。
However , the movement and transformation of n in soil under fertigation remains unclear . the methods of simulation experiment and culture experiment were used to study the movement and transformation of n in soil under fertigation by drip irrigation . the main experimental results were shown as folio wings : ( 1 ) the water infiltration under drop irrigation is a point infiltration ; and the soil moisture in vertical and horizontal directions was increased with the irrigation time , and the movement rate were decreased with the irrigation time 本研究采用室内模拟试验和生物培养试验相结合的方法，研究了在滴灌施肥条件下，化学氮肥施入土壤后的迁移、转化规律以及对作物生长的效应，获得了以下主要结论： ( 1 )滴灌条件下水分以点源入渗土壤，水平和垂向的湿润锋均随入渗时间的增加而逐渐变大，在入渗开始阶段湿润锋的推进速率较大，随入渗时间的延长，湿润锋的推进速率逐渐变慢。
Based on the fundamental theory of dynamics of soil moisture and the condition of water storage pit irrigation , numerical modeling of soil moisture movement of single water storage pit in heterogeneous soil is established . adi ( alternating direction implicit method ) and gauess - seidel iterative method are used to solve it . by using the simulated value of modeling , the relation of water injection volume and maximum horizental distance of moisture frontal are concluded . according to the relation , interval of pits are derived . then , after analyzing the infiltration characteristic of soil moisture under the condition of interference infiltration in multi storage pit , numerical modeling of soil moisture movement of multi water storage pit in heterogeneous soil is established , and its numerical solution is also acquired 利用adi (交替方向隐式差分法)结合gauess ? seidel迭代法对模型进行数值求解。利用模型的计算结果得出了单坑注水量与湿润锋最大水平推进距离之间的关系，并据此确定了坑距。在此基础上，通过对多坑干扰入渗条件下土壤水分入渗特性进行分析，太原理工大学硕士研究生学位论文建立了蓄水多坑非均质土壤水分运动数学模型，并对其进行数值求解。
In the process of trick source infiltration , the increased soil water content is a constant value 0 . 34 for clay loam soil . the distribution pattern of water content in horizontal is similarly with vertical level . the more of the distance away axis , the less of the soil water content , and the decrease is most notable near the wetting front 土壤湿润体内含水率在水平方向上的分布，表现为在同一水平剖面上随着与对称轴之间距离的增加，含水率不断减小，减小的幅度在接近湿润锋处最为明显；土壤湿润体内含水率在垂直方向上的分布，亦表现为在同一竖直剖面上随着深度的增加，含水率不断减小，减小的幅度在接近湿润锋处最为明显。
2 . on the basis of analyzing experimental data for slope land of loess plateau in different slope gradient and rain intensity and soil and water conservation tillage measures , using curve - fitting techniques , a soil infiltration rates model was woke out , the accuracy of the model is tested by a series of experiment data , the result of these indicate that the soil infiltration rates model is accurate and has good stability for slope land of loess plateau . 3 . using soil infiltration rates and runoff time and wetting frontal surface depth of soil infiltration reflect effect of factor affecting soil infiltration rates ( 3 )采用土壤稳定入渗速率、坡面开始产流时间、土壤湿润锋面下渗深度三个指标来反映坡耕地土壤入渗影响(土壤性质、土壤初始含水率、地面坡度、降雨强度、积水深度、水土保持耕作措施等)因素效用大小，建立了各因素与三个指标的关系模型，详细分析了不同水土保持耕作措施强化土壤入渗的影响，其中等高耕作作用最为显著，其次是人工掏挖和人工锄耕。
